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Table 5 Variable Definitions

From: Examining systemic steroid use in older inflammatory bowel disease patients using hurdle models: a cohort study

Variable Identification Codes
IBD encounters to identify provider type HCPCS codes: 99201–99205, 99212–99215, 99241–99245, 99251–99255, 99354–99357, 99401–99404, 99406-99407
Endoscopies ICD-9 procedures: 45.11–45.14, 45.16, 45.21–45.27, 48.23, 48.24; HCPCS codes 43234, 43235, 43239, 44360, 44361, 44376, 44378, 45335, 45378, 45379, 45380, 45381, 45382, 45383, 45384, 45385, 45300, 45303, 45305, 45307, 45308, 45309, 45315, 45317, 45320, 45321, 45327, 45330–45335, 45337–45340, 45345
IBD surgeries ICD-9 procedure codes: 45.7, 45.71, 45.73–45.76, 45.79, 45.8, 45.9, 45.90–45.95, 45.6, 45.61–45.63, 46.0, 46.01–46.04,46.1, 46.10–46.11, 46.13–46.14, 46.2, 46.20–46.24, 48.5, 48.6, 48.61–48.65, 48.69